Stack Gas Reheating with Prime Surface Heat Exchanger Minimizes Vapor Plume And Helps Disperse Moisture

CHALLENGE

Reduce the vapor plume from high moisture content, relatively low dew point stack gas at a Midwest power station.

SOLUTION

Specially designed Tranter PLATECOIL® Prime Surface Heat Exchanger stack gas reheater banks. There are seven 317L SS Style 73D panels with 17 parallel passes and 2 return passes.

RESULTS

  • The banks heat 25,485 m3/m (900,000 SCFM) of flue gas from 52°C to 77°C (125°F to 170°F) using 3.4 bar (50 psi) steam.
  • The flue gases rise higher into the atmosphere before they condense for better dilution and dispersion of the trace acidity and particulates from the scrubber.
  • Good heat transfer without excessive pressure drop that could degrade the performance of upstream components.
  • Easier to clean and maintain than either tubular or finned tube exchangers would be.

PLATECOIL® Prime Surface Heat Exchanger banks mounted downstream of the scrubber raise gas temperature by 22°C (40°F) for better moisture dispersion from the stack.
A PLATECOIL® bank can be installed in a flue duct to recover maximum exhaust heat for use in other areas.